Use mild kitchen detergent (for table or cookware).
Use a soft sponge or cloth.
Remove the bottle boot from the bottle and wash using a sponge and diluted detergent water or lukewarm water, then thoroughly rinse with water.
Wipe the water off with a dry cloth and dry the parts thoroughly.
Caution
Dust adheres easily to the bottle boot. Do not rub them with a towel or similar material while they are wet. Press and wipe these items using a soft cloth.